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Behavior of cerium dioxide nanoparticles in chernozem soils at different exposure scenarios

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Abstract

Nowadays, widespread application of engineered nanoparticles (ENPs) inevitably leads to their release into the environment. Soils are regarded as the ultimate sink for ENPs. The study on mobility of ENPs in soils is important in the assessment of potential risks related to their toxicity. The behavior of ENPs is dependent not only on parameters of soil but also on exposure scenarios, namely, the amount of ENPs trapped in soil. In the present work, the mobility of cerium dioxide nanoparticles (nCeO2) in soils at different exposure scenarios has been studied. The relationship between mobility of nCeO2 and their concentration in soil in the range from 1 to 1000 μg g−1 is evaluated. It is shown that the mobility of nCeO2 decreases with decreasing their concentration in soil and attains the minimum value at the concentration of nCeO2 below 10 μg g−1. In relative terms, only about 0.1–0.2% of nCeO2 at their concentration in soil 10–1000 μg g−1 are mobile and can migrate in soil profile under saturated conditions. The major portion of nCeO2 (about 99.8%) remains immobile in soil. Evidently, the vertical transport of nCeO2 in soil profile should depend on volume of released suspensions. In the case of small or moderate wet deposition, nanoparticles will accumulate in upper soil horizons, where biological activity is highest, and affect the soil inhabitants (plant roots, earthworms, insects, microorganisms, etc.).

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Acknowledgements

The study on elemental analysis of leachates by ICP-MS was performed on the equipment maintained with the support of the Ministry of Education and Science of the Russian Federation (Program of Increasing Competitiveness of NUST “MISiS,” projects No К2-2017-88). The authors are also grateful to Prof. Olga B. Rogova (Dokuchaev Soil Science Institute, Moscow, Russia) and Dr. Anna G. Zavarzina (Faculty of Soil Science, Lomonosov Moscow State University, Russia) for the provided soil samples. The authors are also indebted to Prof. Petr S. Fedotov (Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, Russia) for editing the manuscript.

Funding

The work is supported by the Russian Science Foundation (project No 17-73-10338).

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Correspondence to Mikhail S. Ermolin.

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Responsible editor: Zhihong Xu

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Ermolin, M.S., Fedyunina, N.N. Behavior of cerium dioxide nanoparticles in chernozem soils at different exposure scenarios. Environ Sci Pollut Res 26, 17482–17488 (2019). https://doi.org/10.1007/s11356-019-05187-x

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  • DOI: https://doi.org/10.1007/s11356-019-05187-x

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